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Derivative Instruments and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Detail) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Foreign Exchange Contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivative	$ 1,617	$ 2,766
Cross-Currency Swaps | Net investment hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivative	2,119	910
Interest Rate Swaps | Fair value hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivative	700	700
Forward Starting Interest Rate Swaps | Cash flow hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivative	500	500
Foreign Currency-Denominated Debt | Net investment hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivative	$ 1,831	$ 2,140

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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